Power excavating machine and method of actuating the same



4 Sheets-Sheet 2 June 23, 1925.

E. J. ARMSTRONG POWER EXCAVATING MACHINE AND METHOD OF ACTUATING THESAME Filed Feb. 26. D23

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June 23, 1925.

E. J. ARMSTRONG POWER EXCAVATING MACHINE AND METHOD OF ACTUATING THE3514!.

Filed Feb. 26, 1923 4 Sheets-Sheet s 72b (:Q i I I n? L 2 I40 we L I,

lfatenteddune 23, 1,925.

=-" 1 UNIT-ED STATES 1,542,9551' '2 PATENT OFFICE.

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or ERIE, PENNSYLVANIA, AssIeNon', BY 15 'nasr'eNunN'rs, r mam srmmsnovm. comra Y, or main, rnNNsYLvANm,..a

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Application filed February 26, 1923. Serial No. 621,886.

1T0 all whom it may concern:

it known that I, EDWIN J ArmsrsoNo, a' 'citizenof the United States,residing at Ellis, inthe county of Erie, and State of 6. Pennsylvania,have invented new and useful 1 Improvements in Power Excavating Ma-.i'chines and Methods of Actnating the Same,

"of whichthe following is a specification.

I Power excavating devices, particularly l0 shovels and cranes areoperated very largely Y by steam engines. While'some of these devlceshave been actuated by other types of motors it has been difiicult to getv satisfactory results from such motors due to the failure ofsuch motorsto give the proper control and acceleration tojthe motors used as forinstance the turning engine and the crowding engine. quire a greatamountof power in the total and are used but intermittently,

to get rapid operation of the machine, they must have'great accelerationand be subject Fluid actuated e'n-' to verynice control. gines satisfythis requirement perfectly. In "the resent invention I utilizepreferably a a difierent motor than'the fluid actuated motor, preferablyan explosive enginev and drive the hoist 'directly from this engine in-'asmuch as the hoist ordinarily involves a longer running action j thanthe other partsand it lends itself to the direct action from such motorwith a-fair degree of eiiiciency. It will be understood that the hoistineffort --the-- crowding efiort,; and turnin e ort of these machinesoperate successive y and-are seldom all. working at least at the maximumtogether. In-carryin'g out.'m invention I preferably-use, as beforestate an ex losive engine foroperating'the hoisting mec anism butwhatever motor is used I prefer to com afluid bymeans of a" compressor'ven by the motorfor actuating the crowd'- the'turning engine and in theload on the motor I' "to provi'dethe motor. with J-means automaticallyunloads,thecmhpremi1..-" v a ff 'i'nlg carried by bearings 30 'on osts29 exdunng the -mterval when the engine -1e,; tend1ng up' from theframe. ;Aj' rive' ulley- 7 "-31 is journaled-ontheshaft 28 and-is f'venby albeit 3 2 aipower ulley 33/ T in engine .or .orgertoreduee Pee whichis concerned. Where power suflicient to take These engines do not re-.

but in order,

that tends to'reduce this speed;

iving better and care of the hoisting is provided this samepower in theinterval in which the hoisting effort is small, or has entirely ceasedis con. tinued in storing the energy for operating the crowding orturningengines. Features and details of the inventionwill appear fromthe specification and claims.

The apparatus forming the subject matter of. theinvention and by whichmay be carried out is illustrated in the accompanying drawings asfollows Fig. 1 shows a side elevation of a power shovel.

Fig. 2 a plan view of the operating platform.

Fig. 3 a side elevation of the controlling devices for the engine andcompressor.

Fig. 4 a side elevation of -a transmission,

the platform, 8

form, 9 a circular track on which the rollers operate, 10 a driving gearon the drive shaft- 2, 11 a plnlon meshing withthegear'10, 12a

shaft on which the gear 11 is fixed, 13 a beveled gear on the shaft 12meshing with a [pinion 14,

15 an upright shaft having its 6 the swinging platform, 7 a pivotalmounting of rollers carrying the plataxis coincident with the pivotalmounting 'ofthe frame, 16 a beveled gear on the upper jendof the-shaft15, 17 a gear meshing with the-gear 16, 18a shaft on which the gear 1'}is-mounted', 1919 hearings in which the shaft 18 is journaled, 20 a gearfixed on the shaft 18, 21 a gear meshing with the gear 20, said gearbeing jo'urnaled on a drum shaft .22, 23 and 24 clutchelements ada tedto lock t gear %ar. on the opposite. end of the shaft 22. ese parts are,or may be of ordinary-com .struction. I

1 The gear 26'is driven-bya gear27i The "a1i27 is mounted 'ona shaft 28,the shaft 21 with the shaft 22, an 26 a drum.

lon the engine shaft exten a from internal'oombustion engine-35.- ausual hoisting drum 36 ismounted the shaft 22 and driven by the gear 26.A. hoisting line '37 operates from the drum 36 over the sheaves 38 atthe end of a boom 39. The line extends through a block 40 which block issecured to a dipper 41.

V The power is transmitted from the.v pulley 31 to the gear 27 through aplanetary gear transmission of ordinary type. Thishas the planetarygears-42 and these are controlled bya reversing drum 43 which is lockedin the usual manner by a band 43. The slow Speed ahead is controlled bya drum 44 when locked'by' a band 45. The direct speed is accomplishedwhen the drum 44 is locked b' a clutch 46 with the shaft 28. The clutc46 is operated through thrust pins 47, a bell the sleeve 51 and cranklever 48 ivoted on brackets 49 ex- --tending from t e clutch carrier. 3levers -50 extend-from the sliding sleeve '51. 'An operating; collar 52is journaled on as the usual trunnions 52 to which lever arms,-53'extend. The lever arms are mounted on a shaft 54 and-the shaft isjournaled in bearings 54 on the frame. A lever 55 is fixed on theshaft.54

and has a stud 56 which extends into a controlling slot 57, thecontrolling slot being arranged in a sliding control block 58. The band43" is operated by a lever 59, this lever being ivoted'on a pin 60. Theinner end Q of the ever is connected to the band 43- and 'a roller 61 atits outer end is in the path of a cam 62 on the sliding block 58. Whenthis cam is under the roller the 'band 43 locks the drum 43 and sets theplanetary gear in 3 the reverse in the usual manner. A similar v lever63 1s journaled on a pin connected with I the band 45. The outerendofthe lever 63 is provided witha roller 64 which is in the path of a cam65 on the block 58. When the block is movedto a position bringin the cam65 under the roller 64 the cam 65 ocks.

the drum 44 and sets the planetary gear to slow speed ahead. The slot 57is continued through a-cam 57 and when the sliding block is advancedsuficiently'to carr the stud 56 into the portion 57 of the slot 5,

v the lever 55 isrocked thus through the chain 3 of mechanism heretoforedescribed setting the friction clutch 46 and locking'the sha 28 with thedrive pulley 31. With this mechanism, therefore, when the shovel isrunning under its power, the clutchelementsj23 and 24 being set, themachine may be run forward two speeds and reversed through thismechanism. Further the hoisting drum-may be' handled with the two speedsif desired.

. The sliding block is'provided with a stud .66 which is engaged b onearm of shell crank lever 67; The bell crank lever is'pivotally mountedon a pin 68 on a bracket 69 on the frame. A link 70 extends from thebell crank lever 67 to a controlling lever 71. Thecontrollin .lever ismounted on a shaft 72 carried by arings 73 in position to be, handled byan operator standingin the usual Toggle "position on the platform.- Withthis lever,

therefore, the diflerent speeds and reverse may becontrolledyand thetransmission re- 7 leased if desired. v

v A crowding engine 74 is mounted on the boom. A crank shaft 75 0f the-crowding enginedrives a gear 76 which gear meshes with a gear 77 'Theear 77 is mounted on a shaft 78. The sha 78 is mounted in'a bearing 79on the boom. A gear 80 is also fixed on the shaft 78 and this mesheswith a rack 81 on a dipper stick 82. A controlling valve lever 83operates on the crowding engine in the usual manner and a link 84connects the lever 83 with a lever 85. The lever 85 extends from asleeve 86 and acontrolling lever 87 is fixed on the sleeve 86 inposition to be handled by the operatorfrom is usual position on theplatform. The details of the crowding engme are, or may be, of usualconstructi0n, the en ine being fluid pressure actuated and in t isinstance is actuated by air pressure. 'Aturning engine 88 is mounted onthe platform: A pinion 89 is mounted on the crank. shaft of the turningengine and meshes with a beveled gear 90. The beveled gear 90/ ismounted on a vertical shaft 91. A gear 92 is fixed or the shaft 91 andmeshes with a gear 93. The gear 93 is mounted on-a vertical shaft 94. Agear 95 is fixed on the shaft 94 and meshes with a gear 96 surroundingthe track 1 9. This train of ge ring swings the plat i form in the usualanner of machines of this type. A controlling lever 97 controls Xressureengine 88- in the usual manner.

link 98 extends from the leve 97 to a rock arm 99. The rock arm. 99 is Ifixed on a shaft 100. The shaft is mounted in bearings 100 on theplatform. An operating lever 101 isfixed on the shaft 100 from his usualposition on the platform.

An air receiver 102 is mounted on the platform and a supply pipe 103extends tea in; position to be handled by an operator rom the receiver.A branch pipe leads to the fluid pressure actuated turnmg en- I In'order to control the engine and utilize the intervals in which it isrelieved from the peak load of; the hoist inzoompress n air for thecrowdingand turning engines have provided a mechanism which is illuslmited in Fig. .3. The compressor isprovided 115 and is seated on aperforated disc 118. Tle' lunger 116 is mounted in a cylinder- "leversare pivoted on of thecarrier-135.

with an inlet pipe 111 and this is controlled.-

by an unloading 'valve112. The unloadin valve has the usual valve seat113 on whic operates the unloading valve 114'. A stem 115 leads from thevalve 114 to a plunger 116. Aspriiig 117 is arranged around the stem hecylinder is in communication with a chamber 120 and a pi 121 leads fromthis chamber to a pilot .v'a ve 122. The pilot' valve is provided with aneedle valve shaped element 125 and this is provided with a stem 126. Aspring 127 tends to close the valve. A trunnion 128 is arranged at theupper end of the stem126 and extends into a slot 129 on a lever. 130.The lever 130 is pivoted on a bracket 131 and has a forked end 132 whichrests on a button 133. The

button is mounted on a overnor stein 134. The stem extends throug acarrier 135 and is provided with the usual spool 136 at its upper endinto which the ends 137 of the weighted leversslg exte The weighted ins139 on ahead 140 he carrier 135 isjournaled in the governor frame141-and has a beveled gear 142 arranged at its lower end.

A beveled gear 143 is fixed on a shaft 144 and is driven {by a gear 145.Thefgear- 145 is driven from a crank shaft of the engine so that thegovernor is subjected to the en-- gine speed.

When the engine is' slowed slightly by the efiort of hoisting gravityoperating on the levers preponderates over centrifugal force and theweighted levers drop lifting" the stem 134 and with it the lever-130.The eifect of this is to open the valve :122. The

' pipe 123 leads to the valve-from the receiver so that as the valveopens air 'is turned into the chamber 120- and to the cylinder 119 and 0rates on the piston 116.to close the unloa ing valve 112. Theefiect'of'this to cut ofi the intake to the compressor and.- thusunloads the compressor in the usual manner so that during thehoisting'efiort,

' or at leastthe time that the engine is carrying the peak load thecompressor is unloaded and the en 'ne thus relieved of this entireenergy part of the load elivers its to the hoisting drum.

I preferto utiliaethe same governor as a matter of-eontrol of thehoisting engine and have, therefore, provided a governor valve ofusual-type'146 'o'n'the .ste'm 134.

This valveoperates in the usual diaphragm 147, the diaphragm beingarranged in a body 148, the body having'an inletend. 149

and connected with a carburetor 150 by means of a pipe 151.Thecarburetor is connected with a fuel. supply through a pipe 150 and apipe 152 leads from the governor valve to a manifold 152" of the engine.While the governor operates. as a safety deviceand prevents the runningaway of theengine and controls the en e to an approximately uniformspeed t re is, of course, the slight falling off of speedv sufli- -cientto actuate the governor whic we .h-ave heretofore described and whichautomatically.

unloads the compressor.

In the operation of the machine nerally the operator dro the shovel,crow it into the work with t e crowding engine, at the same timehoisting it to some extent, it beiii? understood that while the unloadercuts O the compressor during the hoisting'operation the receiver hasample'supply for the crowding engine in a single or even a series ofoperations. The hoisting operation 18,

then accomplished combinin this to some extent with the action of theoistii g eng ne to locate the boom and the shovel is swung "in the usualmanner. It will be seen there- 'fore, that the intervals between thehoisting efforts are utilized by the engine in storing up the energy forthe .crowding and turning engines and, therefore, an approximatelyconstant load vs maintained on the engine and thus the shovel .mayoperate very economically and very rapidly and further the shovel isrelieved of the offensive smoke and conditions which are incident to the95 an explosive engine 4 as the primary power of the shovel n-the 1 useof steam.

While I have shown loading the compressor when'the. receiver reaches apre-determined broader bases of my invention I do not wish to limited tothis. ltype of engine. I refer to-utilize the u oader for unressure. Inf

'ryingout this feature "I" onnect the chamher 120 by a passage 154' witha cylinder .154. A piston; 155 operates in this cylinder and is crowdedforward by A valve 157 is carriedby the piston and closes nected withthe receiver through the pipe 153. When the receiver pressure risesabove the pie-determined pressure, this pressure,

being communicated through the pipe 153 to the cylinder 154, acts on thepiston 15 5 and opens the valve, thus delivering an under pressurecompressor. In. order to exhaust the air vent 158. 2

What I claim as new is tothe piston 119 and closing the unloader valveand thus unloading the I from the chamber 120 I provide a small 1. In amachine, the combination of a 3 plurality of instrumentalities havinginter I mitten't and successive operation; a primary motor operatingdirectly. on one of said instrumentalities; a secondary motor operatingon the second of said instrumentalities; an energy storing meanssupplied from the primary motor and supplying energy to thesecondarymotor; and devices for relieving the primary motor from theefiortofdelivering energy to the energy storing means during a peak loadon the instrumentality actuated directly from the primary motor.

2. In a machine, the combination of two instrumentalities operatingintermittently and successively; a primary motor directly actuating oneof said instrumentalities; a fluid actuated secondary motor actuatingthe other of said instrumentalities; a compressor driven by the primarymotor'and compressing fluid for actuating the secondary motor; and meansfor relieving the primary motor of the load of the compressor during thepeak load on the instrumentality actuated directly from the primarymotor.

'3. In a power excavating machine, the

combination of adigging implement; a pri- I mary motor operatingdirectly on said digi ging instrument; a secondary motor operating onsaid implement; energy storing means actuated by the primary motoranddelivering energy to the secondary motor; and devices relieving theprimary motor of the load of delivering ener to the energy storing meanswhile delivering its peak load directly to the implement.

4. In a power excavating machine, the combination of a. diggingimplement; a primary motor acting ,directly on the implement; a fluidpressure actuated secondary motor acting on the implement; a compressorcompressing'fluid for actuating the secondary motor driven by theprimary motor; and devices relieving theprimary motor of the load of thecompressor while delivering the peak load directly to the implement.

5. In a power excavating machine, the combination of a diggingimplement; a

' hoisting device for the implement a primary motor operating directlyon the hoisting device; a secondary motor acting on the implement; anenergy storing means supplied from the primary motor and supplyingenergy to the secondary motor; and.

means for relieving the primary motor of the load of supplying energy tothe energy storing means while subjected to the peak load of thehoisting device.

6. In a power excavating machine, the combination of a diggingimplement; a hoisting device acting on the implement; a

, primary motor driving the hoisting device;

a secondary fluid pressure actuated motor actlng on the implement; acompressor driven by the primary motorand supplying fluid: for thesecondary motor; and means for relieving the primary motor of the loadof the compressor while subjected to the peak load of the hoistingdevice.

7. In a machine, the combination of a plurahty' of instrumentali-tleshaving intermittent andsuccessive operation; an internal combustionengine acting as a primary motor operating directly on one of saidinstrumentalities; a secondary motor operating on the second of saidinstrumentalities; an-energy storing means supplied-from .the primarymotor and suppl ing energy to the secondary motor; and evlces forrelieving the pr mary motor from the effort of delivering energy to theenergy storing means during a eak load on the instrumentality actuatedirectly from the primary motor. I r

8. In a maehine, the combination of two instrumentalities operatingintermittently and successively an internal combustion engine acting asa' primary motor directly actuating one of said instrumentalities; afluid actuated secondary motor actuating I the other of saidinstrumentalities; a compressor driven b the primary motor andcompressing flui for actuating the secondary motor; and means forrelieving the pri- 'mary motor of the load of the compressor combinationof a digging implement; an

internal combustion engine acting as a primary motor operating directlyon the imple-' ment; a fluid pressure actuated secondary motor acting onthe implement; a-compressor compressing fluid for actuating thesecondary motor driven by the primary motor; and devices relieving theprimary motor of the load of the compressor while delivering the peakload directly to the implement.

11. In a power excavating machine, the combination of a diggingimplement; a hoisting device for the implement; an internal. combustionengine acting as a primary motor operating directly on the hoistingdevice; a secondary motor acting on the implement; an energy storingmeans supplied from the primary motor and supplying energy to thesecondary motor; and

means for, relieving the primary motor of the load of supplying energyto the energy storing means while subjected to' the pea load'of thehoisting device.

12. In a power'excavating machine, the

combination of a digging implement; a hoisting device acting on theimplement; an internal combustion engine acting as a primarymotor-driving the hoisting device; a secondary fluid pressure actuatedmotor acting on the implement; a compressor driven by the primary motorand'supplymg fluid for the secondary motor; and means for relieving theprima peak load the hoisting device.

13, In a power excavating machine, .-the combination of a rotatingplatform; a fluid pressure actuated turnin engine for the platform;ahoist; a nonuid presure actu ated motor actuating the hoist; acompressor actuated by the non-fluid actuated motor compressing thefluid for the turning engine; and means for relievin the'non-fluidpressure actuated motor-of t eload of the com ressor while deliveringits peak load to ehoist.

14. In a power excavating machine, the combination of a rotatingplatform;fa fluid pressure. actuated turning en e for the platform; ahoist; anv interna combustion engine actuating the hoist; a compressoractuated by the internal combustion engine compressing fluid for theturning engme; and vmeans relieving the internalcombustion e e of theload of the com ressor while de vering its peak load 'to the cist. v 15.In a power shovel, the-combination of a dipper; a-dipper stick; a fluidpressure actuated crowdmg. engine :acting on the dipper-"stick; a hoist;a non-fluid pressure actu ated motor actuating the hoist; -a compressprdriven by the non-fluid presure actuated motor; and means for reli vmgnon-fluid pressure actuated motor the I load of the' comgressor while.'delivering its Y peak loadtothe oist. 16. In a power shovel thecombination eta-dipper; a dipper stick; a fluid pressureonthe dip- Iactuated crowding engine acting pe r st1ck a holst; an internacombustion engme actuating the. hoist; a'compressor compressing fluidfor thecrowdingf engme;

and means for relieving ,the' internal com form; a hoista non-fluidpressure actuated motor actuat ng the hoist; a compressoractuated-girlie motor compressing fluid for the crow and turning engm S;and.

of the compressor while delivering the peak load'to the hoist. v

18;, In a power shovel, the combination of adipper; adipper-stick;.afluid p are.

0; actuated crowding engine actuating the dip:

- I 1mm motor of the load of the com ressor whie subjected to the the 1actuated by the internal combustion engine fluid V ressurev actuatedturning engme turning t e plat-f means for re 'eving the motor of theload.

, rstick; a platform on which the v 'pper stick is mounted; a-wfluidressure' actuated turning engine turnin t e platg 2 form; ahoist; an internal com ustlon en-' gine actuating the hoist; a P 161.;

,ated by the internal combustion pressing" fluid for the crowdingegines; and'means for relic the intern combustion engine of the oad ofth. 3m resstsor while delivering its load t, e 01 19; In apower.excavating combination of a digging implement; a

"primarymotor acting rectly on the diggmg implement throu h a variableimplement; an e ergy storing means receivingl its ener from the primarymotor and de 'verin'g t e same to the secondary motor; and devices forrelieving the primary motor of the load of delivering one to the energy.storing means whlleidehvering its peak load directly to the implement.

20. In a .power excavatmg machine, the combination of a non-fluidactuated motor; a digging implement; adirect connection 'between themotor and the digging plement;a traction directly connected wit themotor; a variable s transmission between the motor and t e tractiongearin; a fluid rewure actu'ated engine act' .on the 'gging im?plement;v and a. co ressor driven by the -.motor. f r 21.. In apowerexcavating machine, th combination of anon-fluid actuated motor; adigging implement; a direct connection between themotor and thedigging-implement; atraction gearing adapted to be directly 'connected'withythe motor; a variable speed transmission between the motor andtraction gearing; a'fluid resure actuated engine acting on-the gingimplement; a compressor driven by e'motor;

and devices for relieving the motor of the load of the compressor whiledelivering its "peak load directly to the digging implement. I

22. In a power excav machine, the. combination of a digging implement;an internal combustion engme acting as a slrimary motor and actuatingthe implement "rectly; a secondary motor operating on the implement;anenergy-storing means receiving its energy from the primary 'motor anddelivering the same to the secondary motor; and'devices responsive tovariatlons in speed of primary motor -'relieving the primary motor ofthe 'load of delivering one 'to the energy storing meanss upon a f'speed of the r agy o a 23. n a power excavating machine,.thecombination of a di 5 "implement; a

. ,transmission' betwee t e motor and lmplement; a seconday diotoroperating on the v adapted to'be I llO pnmary motor actuatmg theimplement directly; a secondary motor operating on the implement; anenergy stormg meansreceivi its energy from the primary motor anddelivering the same to the secondary motor; and devices responsive tovariations in speed of the primary motor relieving the primary motor .ofthe load of delivering energy totheenergy storing means upon a decreaseof; speed of the rimary motor.

24. In ajpower' excavat ng combination of a digging lmplement; aninternal combustion engine acting as a primary motor directly on theimplement;

v a; secondary motor acting on the implement;

energy storing means receivin its energy 7 from the rimary motor and deivering it to the seoon ary motor; a governor for the pri- 'mary motor;and devices controlled by the governor relieving the primary motor of tthe load of delivering energy to the energy fistring eans upon adecrease of speed of 7 internal combustion engine actingdirectly theprimary motor..

'. In a power excavating machine, the

"combinationof a digging implement; an internal combustion engine actingas a primary motor directly upon the implement; a

secondary motor acting upon the implement;

energy storing means receivin its energy from the primary motor an upon"the digging implement; fluid ac- "tuated' engine operating upon theimplement; a compressor operated by the internal combustion engine anddeliverin fluid to the fluid actuated engine; an

devices responsive to the speed of the internal combustion enginerelieving the internal combustion engine of the load of the compressoruponv a decrease of speed of the internal combustion engine.

- 27. In a power excavatlng machine, the combination of a diggingimplement; an internal' combustion en ine acting directly upon thedigging imp ement; a fl uid actuated engine operating upon theimplement; a compressor operated by the internal combustion engine anddelivering fluid to the fluid actuated engine; a governor controllingthe internal combustion engine; and devices actuated by the governorrelieving the internal combustion engine of the load of the compressorupon a decrease of speed of the internal combustion engine.

28. In a power excavating machine, the

combination of a digging implement; an

- internal combustion engine acting directly on the implement; a fluidactuated engine 29. In machine, the

combination of a relieved from delivering operating on the implement; acompressor actuated. by the internal combustion engine delivering fluidto a receiver; a connection between the receiver and the fluid actuatedmeans responsive to the speed of the internal combustion engine and thepressure of the receiver actuating the unloader.

combination of a digging implement; an internal combustion engine actingdirectly on the implement; a fluid actuated engine acting on theimplement; a-compressor a receiver receiving fluid from the compressor;

a connection between the receiver and the fluid actuated engine; anunloader for the compressor; a governor controlling the internalcombustion engine; and means actuated by the governor responsive tothespeed of the governor and the pressure of the receiver actuating theunloader.

30. In a power excavating device, th

digging implement; an internal combustion engine dlrectly actuating theimplement; a fluid actuated engine actuatin'g the im lement; a receiver;a connection between the receiver and the fluid actuated engine; acompressor actuated by the internal combustion engine delivering to thereceiver; an unloader for the compressor; fluid actuated meanscontrollin the unloader; and devices responsive to t e speed engine; anunloader for the compressor; and It a power excavating machine, the

of the engine controlling said fluid actuated I means.

31. In a' power excavating device, the combmation of a diggingimplement;an internal combustion engine. directly actuating the implement; a fluidactuated engine actuating controlling said fluid actuated means.

32. The method of delivering inter mittent and successive power impulsesto instrumentalities which consists in directly exerting a power impulsefrom a primary motor, storing ener from the rims. motor during interv sduring which it IS a direct power impulse, and drawing from the storedenergy to deliver impulses to the instrumentality through a secondarymotor.

33. The method of'actuating a power excavating machine which consists indelivermga wer impulse to'a di gin im lement of said machine directlyrom a glimary motor, storing energy from th pr combustion enginedelivering to themotor during intervals in which it-is liejved from-theload of exerting impulses directly to the digging implement, anddelivering the energylso stored to the digging implement throug asecondary motor.

34. The method of operating power excavating devices having a digginginstrumentality which consists in directly delivering energy to theinstrumentality from an internal explosive motor, storing .energy fromthemotor while it is relieved from the load directly received from theiIlStIll-g intervals in which mentality, and delivering the energy sostored to. a second motor operating on the digging instrumentality.

35. The method of actuating power excavating machines having a digginginstrumentality which consists in ener to the instrumentality directlyfrom a prnnary motor, compressing fluid by energy from the prima motorduring it is relieved of the peak load through its direct connectionwith the instrumentality, and operating the instru mentality through afluid pressure actuated motor from the fluid compressed.

36. The method of actuatingpower excavating machines having a digginginstrumentality which consists in delivering power directly to theinstrumentality from an internal combustion engine, compressing fluid benergy from the engine at intervals when t e engine is relieved of thepeak load from the direct connection to the instrumentality, andoperating the ins'trumentality by a fluid actuated motor actuated by thefluid compressed.

37 The method of actuating power excavating machines having a digginginstrumcntality which consists in delivering power directly to theinstrunlizntality to hoist the same from a primary otor, storing energyfrom the primary motor during intervals in which the primary motor isrelievedof the load of the hoist, and 'delivering the energy so storedto a turning motor swinging t e diggin glinstrumentality. j

38. v e method of actuating power-exca vating machines havinga digginginstrumentality which consists in delivering power directly to the.instrumentality to hoist the same from a primary motor, storing enerfrom the primary motor during intervals in which the primary motor isrelieved of the delivering load of the hoist, and delivering the energyso stored to a crowding engine operating on the digging instrumentality.I

' 39. The method of actuating power excavating machines having a digginginstrumentality which consists in delivering power directly to theinstrumentality to hoist the same from a primary motor, storing energyfrom the primary motor during intervals m which the primary motor isrelieved of the load of the hoist, and delivering the energy I so storedto a crowding and turning engine swinging and crowding the digginginstrumentality.

40. The method of actuating power excavating machines having a digginginstrumentality which consists in delivering power directly to theinstrumentality to hoist the same from an internal combustion engine,storing energy from the internal combustion engine during intervals inwhich the internal combustion engine is relieved of theload of thehoist, and delivering the energy so stored to a turning motor swingingthe digging instrumentallty.

41. The method of actuating power excavating machines having a digginginstrumentality which consists in delivering power directly to theinstrumentality to hoist the same from an lnternal combustion engine,

storing energy from the internal combustion engine during intervals inwhich the internal combustion engine is relieved of the load of thehoist, and delivering the energy so stored to a crowding engineoperating on the digging instrumentality.

42. The method of actuating power exca vating machines'having a digginginstru-' mentality which consists in delivering power directly to theinstrumentality to hoist the" same from an internal combustion engine,storing energy from the internal combustion engine during intervals inwhich the internal combustion engine is relieved of the load of thehoist, and delivering the energy so 'stored to a crowding and turningengine swinging and crowding the digging instru mentality.

In testimony my hand. EDWIN J. ARMSTRONG.

whereof I have hereunto set

